HASIBUAN, S. R. (1988). English for Specific Purposes: Economics. Gramedia.
Cita Chicago Style (17a ed.)HASIBUAN, Sofia Rangkuti. English for Specific Purposes: Economics. Gramedia, 1988.
Cita MLA (8a ed.)HASIBUAN, Sofia Rangkuti. English for Specific Purposes: Economics. Gramedia, 1988.
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